One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,13)(12,14)(15,16)(17,18,24,41,38,30,39,31,23,27,21,28,22,19,25,42)(20,32,44,46,40,33,37,26,36,48,34,29,35,47,43,45)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19,21,31,38,18,25,28,23,30,24,42,22,27,39,41)(20,33,34,45,40,48,43,46,36,47,44,26,35,32,37,29)(3,7)(6,8)(10,14)(13,16)(17,20,23,36)(18,26,27,45)(19,29,30,46)(21,37,24,43)(22,40,38,35)(25,44,39,34)(28,47,41,33)(31,32,42,48)(1,3,4,7)(2,6,5,8)(18,27)(19,30)(26,45)(28,41)(29,46)(31,42)(32,48)(33,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.